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After we have modified the rule, if we want the modification to take effect permanently, we must use service iptables save to save the rule. Of course, if you misoperate the rule but do not save it, then after restarting iptables with the service iptables restart command, the rule will return to the same appearance as it was when the/etc/sysconfig/iptables file was last saved.由BBC和温斯坦公司（The Weinstein Co.）联合制作的六集大型电视剧《战争与和平》（War and Peace）主演人选本周日公布，迪士尼新版《灰姑娘》主演莉莉·詹姆斯（Lily James）将出演女主角“娜塔莎”（Natasha Rostova），而《血色黑金》（There Will Be Blood）的保罗·达诺（Paul Dano）与《佳人蓓儿》（Belle）的詹姆斯·诺顿（James Norton）则将分别饰演“彼埃尔”（Pierre Bezukhov）和“安德烈”（Prince Andrei Bolkonsky）。3.3 For example, create a table to record the name and event stamp of each event schedule.Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.6.2 For example她看向院外，去年这时候，还带我们下塘去摘菱角和莲蓬，好热闹的。The second scheme is to use proxy mode to write the following code for preloading pictures: